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HIRSCHMANN NB2810 NetModule Router User Manual

5.6.2. IPsec  
IPsec is a protocol suite for securing IP communications by authenticating and encrypting each packet  
of a communication session and thus establishing a secure virtual private network.  
IPsec includes various cryptographic protocols and ciphers for key exchange and data encryption and  
can be seen as one of the strongest VPN technologies in terms of security. It uses the following  
mechanisms:  
MechanisDescription  
AH  
Authentication Headers (AH) provide connectionless integrity and data origin authentica-  
tion for IP datagrams and ensure protection against replay attacks.  
ESP  
SA  
Encapsulating Security Payloads (ESP) provide confidentiality, data-origin authentication,  
connectionless integrity, an anti-replay service and limited traffic-flow confidentiality.  
Security Associations (SA) provide a secure channel and a bundle of algorithms that pro-  
vide the parameters necessary to operate the AH and/or ESP operations. The Internet  
Security Association Key Management Protocol (ISAKMP) provides a framework for au-  
thenticated key exchange.  
Negotating keys for encryption and authentication is generally done by the Internet Key Exchange  
protocol (IKE) which consists of two phases:  
Phase  
IKE  
Description  
IKE authenticates the peer during this phase for setting up an ISAKMP secure associa-  
phase 1 tion. This can be carried out by either using main or aggressive mode. The main mode  
approach utilizes the Diffie-Hellman key exchange and authentication is always encrypted  
with the negotiated key.The aggressive mode just uses hashes of the pre-shared key and  
therefore represents a less-secure mechanism which should generally be avoided as it is  
prone to dictionary attacks.  
IKE IKE finally negotiates IPSec SA parameters and keys and sets up matching IPSec SAs in  
phase 2 the peers which is required for AH/ESP later on.  
NB2810  
125  
User Manual for NRSW version 4.8.0.102  
GeneralDetails
NameHIRSCHMANN NB2810 NetModule Router User Manual
MakeHIRSCHMANN
LanguageEnglish
FiletypePDF (Download)
File size MB
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